<%@ page import="java.util.ArrayList" %><%--
  Created by IntelliJ IDEA.
  User: 86130
  Date: 2020/11/27
  Time: 11:25
  To change this template use File | Settings | File Templates.
--%>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
    <title>EL表达式运算符</title>
</head>
    <body>
        <%
        String str1 = null;
        String str2 = "";
        ArrayList list = new ArrayList();

        pageContext.setAttribute("str1",str1);
        pageContext.setAttribute("str2",str2);
        pageContext.setAttribute("list",list);
        %>
    ${empty str1}
    ${empty str2}
    ${empty list}




</body>
</html>
